Sea-going canal-boat.



A. 6I A. WI. MCDOUGALL.

SEA GOING CANAL BOAT.

APPLICATION FILED MAR. 27, 1916.

W I TNESSES:

7 yay-fk A -musas ALEXANDER MCDOUGALL AND 'ALEXANDER MILLER MCDGUGALL, OF DULUTH,

MINNESOTA.

SEA-GOING CANAL-BOAT.

Specification of Letters Patent.

Patented July 17, 191'?.

To all whom it may concern:

Be it known that we, ALEXANDER McDou- GALL and ALEXANDER MILLER MCDOUGALL, citizens of the United States, residing at Duluth, in the county of St. Louis and State of lizllinnesota, have invented certain new and useful Improvements in Sea-Going Canal-Boats, of which the following is a, specification, reference being had therein to the accompanying drawing'.

This invention consists of certain new and useful improvements in metal ship construc tiou and relates especially to the form of hull construction for sea-going canal boats, such as disclosed in our United States Patent No. 1,128,886, dated Feb. 16, 1915; also in the co-pending application upon vessels of Sept. 20, 1915, Ser. No. 51581, that is, a vessel so constructed that it is peculiarly adapted to lalternative use in canals or open water.

One of the objects is to produce a practical form of hull, during the construction of which, as nearly as possible, all material may be used just as it is received from the mills and without additional heating or` bending.

Another object is to produce a form of hull adapted to the purposes above described and being absolutely quadrilateral in cross sec tion throughout.

Still other objects and advantages in construction will appear in the further description of the invention.

In the accompanying drawings forming. part of this application and in which like reference characters indicate like parts:

Figure 1 is an outline plan view of our improved form of ships hull.

Fig. 2 is a side elevation of same.

Figs. 3, 4, 5, 6, 7, 8 and 9 are cross sectional outlines taken on lines A, B, C, D, E, F, G, respectively, Fig. 1.

Fig. 10 is a side elevation of the detached skeg, and

Fig. 11 represents seven cross sectional views of the skeg taken on correspondingly numbered dotted lines, Fig. 10.

1 represents the deck of the hull, 2 the bottom, 3 the sides, 4 the stem and 5 the stern.

The bow end of the hull is formed identical to that shown in the above mentioned patent and co-pending application, that is,

rectangular in cross section and wedge shaped horizontally, but from a point approximately one fourth the length of the hull from the stern the side walls converge gracefully aft to the stern, which latter is preferably formed in a straight transverse line, in length approximately one half the distance across the deck amidship.

The after side walls may be formed at right angles to the deck if desired, but we prefer to have them incline inwardly downward forming acute angles between them and the deck and obtuse angles between them and the bottom 2 of the stern.

The bottom 2 of the stern is preferably of a graceful convex form but substantially straight athwartships at all points.

Thus is formed a hull having a straight sided wedge shaped bow and a graceful polygonal stern, the lhull being quadrilateral in cross section throughout, and one that can be constructed wholly of mill. run metal material.

A skeg 6 is built of fabricated material having rigidly fixed therein the stern post 7 and rudder shoe 8 which are made of a shape and size to correspond to the requirements of each particular vessel, and it is evident that the skeg may be thus constructed independent of the hull of the vessel and subsequently attached thereto, it being made of a shape to properly fit the stern. v

For the purpose of attachment, the plate of which the skeg is made, may be flanged laterally as at 9 to provide means for riveting to the bottom 2 of the stern or suitable angle irons may be used in lieu thereof.

Having thus described our invention what we claim and desire to secure by Letters Patent, is:

1. A ships hull of the character described, quadrilateral in cross section from stem to stern, straight sides in the bow thereof, and inclined sides and bottom in the stern thereof, substantially as described.

2. A ships hull being quadrilateral in cross section from stem to stern, having a convex inclined bottom to the stern the entire width thereof and extending from the bottom of the hull to the lower edge of the stern.

3. In a ships hull having a wedge shaped hcw. Stern having straight Sides and flat convex bottom extending the entirewidth ythereof from the bottom of the hull to the eXtreme stern end.

4. A ships hull of the character described, quadrilateral in cross section from stemto stern, straight sides in the bow thereof, inclined sides and bottom in the stern thereof, said bottom being slightly convex, substantially as described. Y

5. The combination with a ships hull quadrilateral inV cross section throughout and having an inclined bottom in the stern thereof, a substantially V-shaped skeg Y formed separately from the hull and having laterally projecting continuous anges upon the uppermost edges thereof, for engagement with the bottom of the stern of the hull, substantially as described.

In testimony whereof we hereunto aiiix our signatures in the presence of two witzo y Copies of this patentvmay be obtained for iive centseach, by addressing the Commissioner of Patents,

Washington, DIC. 

